[FLTMGR] Latest from my branch (#135)

[FLTMGR] Latest from my branch (#135)

[FLTMGR][KMTEST]
Squash and push my local branch across to master as the patch is getting a bit large. This is still WIP and none of this code is run in ros yet, so don't fret if you see ugly/unfinished code or int3's dotted around.

[FLTMGR] Improve loading/reg of filters and start to implement client connections
- Implement handling of connections from clients
- Implement closing of client ports
- Add a basic message waiter queue using CSQ's (untested)
- Hand off messages for the comms object to be handled by the comms file
- Initialize the connection list
- Add a registry file which will contain lib functions for accessing filter service entries

- [KMTEST] Initial usermode support for testing FS mini-filters
- Add base routines to wrap the win32 'Filter' APis
- Add support routines to be used when testing FS filter drivers
- Move KmtCreateService to a private routine so it can be shared with KmtFltCreateService
- Completely untested at the mo, so likely contains bugs at this point
- Add support for adding altitude and flags registry entries for minifilters
- Allow minifilters to setup without requiring instance attach/detach callbacks
- Add tests for FltRegisterFilter and FltUnregisterFilter and start to add associated tests